Mercurial > hg
view tests/test-diffdir.t @ 16363:2cdd7e63211b
parsers: incrementally parse the revlog index in C
We only parse entries in a revlog index file when they are actually
needed, and cache them when first requested.
This makes a huge difference to performance on large revlogs when
accessing the tip revision or performing a handful of numeric lookups
(very common cases). For instance, "hg --time tip --template {node}"
on a tree with 300,000 revs takes 0.15 before, 0.02 after.
Even for revlog-intensive operations (e.g. running "hg log" to
completion), the lazy approach is about 1% faster than the eager
parse_index2.
author | Bryan O'Sullivan <bryano@fb.com> |
---|---|
date | Thu, 05 Apr 2012 13:00:35 -0700 |
parents | 2063d36b406e |
children | 29c8e35d3283 |
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$ hg init $ touch a $ hg add a $ hg ci -m "a" $ echo 123 > b $ hg add b $ hg diff --nodates diff -r 3903775176ed b --- /dev/null +++ b/b @@ -0,0 +1,1 @@ +123 $ hg diff --nodates -r tip diff -r 3903775176ed b --- /dev/null +++ b/b @@ -0,0 +1,1 @@ +123 $ echo foo > a $ hg diff --nodates diff -r 3903775176ed a --- a/a +++ b/a @@ -0,0 +1,1 @@ +foo diff -r 3903775176ed b --- /dev/null +++ b/b @@ -0,0 +1,1 @@ +123 $ hg diff -r "" hg: parse error: empty query [255] $ hg diff -r tip -r "" hg: parse error: empty query [255]